Basic Statistics in < 1 Hour What is statistics? Why do we need statistics? Presented by:

Leslie McIntosh, PhD, MPH Inspired by Harvey Motulsky's Intuitive Biostatisics & Edvard Munch The Overview Sample Population Field of study that takes information from a small amount of data (sample) and makes generalizations to a larger setting (population) There are limited resources (e.g. money, data, time) in which to make informed decisions. Greek Symbols Confusing

Terminology significant error hypothesis a result that would have been unlikely to occur by chance alone Does NOT mean

important, meaningful, clinically significant statistically Or that you should stop thinking about the data Abstract Concepts Populations

Probability Distributions

Null Hypotheses Why is statistics hard to learn? MATH MATICS SCI NCE Fear of Math statistical hypothesis testing helps one decide whether an observed difference is due to chance Probability, Not Certainty Taught from math angle, not science Statistics through examples Guess the age How much soda did you consume over the weekend? Estimated Age - Actual Age = Error (aka variability) Error = mistake Need clear definitions of soda, time-frame, and unit of measure Urn 1

50% red balls Urn 2

?% red balls Probability is not Intuitive

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# Basic Statistics in Less than an Hour: The Overview

April 27, 2011

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